Callixylon (Archaeopteridales) is the only type of fossil plant recorded from the Devonian of Oklahoma. Callixylon is found as petrified logs in the marine Woodford Shale.
![Petrified Wood](https://samnoblemuseum.ou.edu/wp-content/uploads/2017/02/Callixylon-00009582.jpg)
![Petrified Wood](https://samnoblemuseum.ou.edu/wp-content/uploads/2017/02/Callixylon-00009582-675x1024.jpg)
Callixylon sp.OPC 3244-9582; Petrified Wood; Devonian; Woodford Shale; Pontotoc County, Oklahoma; CC BY-NC-ND 4.0
Callixylon sp.
![Petrified Wood](https://samnoblemuseum.ou.edu/wp-content/uploads/2017/02/Callixylon-00008928.jpg)
![Petrified Wood](https://samnoblemuseum.ou.edu/wp-content/uploads/2017/02/Callixylon-00008928-1024x647.jpg)
Callixylon sp.OPC 9999-8928; Petrified Wood; Devonian; CC BY-NC-ND 4.0
Callixylon sp.
![Petrified Wood](https://samnoblemuseum.ou.edu/wp-content/uploads/2017/02/Callixylon-00009599.jpg)
![Petrified Wood](https://samnoblemuseum.ou.edu/wp-content/uploads/2017/02/Callixylon-00009599-1024x664.jpg)
Callixylon sp.OPC 9999-9599; Petrified Wood; Devonian; CC BY-NC-ND 4.0